Remove simplefilter calls that aren't necessary (#1230)

Author: alex

tests/test_ssl.py

@@ -32,7 +32,6 @@
 )
 from sys import getfilesystemencoding, platform
 from typing import Union
-from warnings import simplefilter
 from weakref import ref
 
 from cryptography import x509
@@ -3121,7 +3120,6 @@ def test_text(self):
         """
         server, client = loopback()
         with pytest.warns(DeprecationWarning) as w:
-            simplefilter("always")
             count = server.send(b"xy".decode("ascii"))
             assert "{0} for buf is no longer accepted, use bytes".format(
                 WARNING_TYPE_EXPECTED
@@ -3329,7 +3327,6 @@ def test_text(self):
         """
         server, client = loopback()
         with pytest.warns(DeprecationWarning) as w:
-            simplefilter("always")
             server.sendall(b"x".decode("ascii"))
             assert "{0} for buf is no longer accepted, use bytes".format(
                 WARNING_TYPE_EXPECTED